Journal
OPTICS EXPRESS
Volume 24, Issue 17, Pages 19344-19353Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.019344
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/M029042/1]
- China Scholarship Council (CSC) [201406895013]
- Shanghai University International Cooperation and Exchange Fund
- National Natural Science Foundation of China (NSFC) [61205128]
- Shanghai Natural Science Foundation (SNSF) [13ZR1414800, 14ZR1415400]
- EPSRC [EP/M029042/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M029042/1] Funding Source: researchfish
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The structural evolution from void modification to self-assembled nanogratings in fused silica is observed for moderate (NA > 0.4) focusing conditions. Void formation, appears before the geometrical focus after the initial few pulses and after subsequent irradiation, nanogratings gradually occur at the top of the induced structures. Nonlinear Schrodinger equation based simulations are conducted to simulate the laser fluence, intensity and electron density in the regions of modification. Comparing the experiment with simulations, the voids form due to cavitation in the regions where electron density exceeds 1020 cm(-3) but is below critical. In this scenario, the energy absorption is insufficient to reach the critical electron density that was once assumed to occur in the regime of void formation and nanogratings, shedding light on the potential formation mechanism of nanogratings. (C) 2016 Optical Society of America
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